Average Weather in Kodiak Alaska, United States
In Kodiak, the summers are short, cool, and mostly cloudy and the winters are long, very cold, wet, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 28°F to 62°F and is rarely below 14°F or above 69°F.
Based on the tourism score, the best time of year to visit Kodiak for warm-weather activities is from mid July to late August.
The warm season lasts for 2.7 months, from June 22 to September 14, with an average daily high temperature above 57°F. The hottest day of the year is August 10, with an average high of 62°F and low of 51°F.
The cold season lasts for 4.7 months, from November 10 to April 2, with an average daily high temperature below 41°F. The coldest day of the year is February 7, with an average low of 28°F and high of 36°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Kodiak, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Kodiak begins around July 13 and lasts for 4.3 months, ending around November 24. On October 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 48% of the time, and overcast or mostly cloudy 52% of the time.
The cloudier part of the year begins around November 24 and lasts for 7.7 months, ending around July 13. On January 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 65% of the time, and clear, mostly clear, or partly cloudy 34% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Kodiak varies throughout the year.
The wetter season lasts 7.1 months, from September 4 to April 8, with a greater than 37% chance of a given day being a wet day. The chance of a wet day peaks at 45% on December 18.
The drier season lasts 4.9 months, from April 8 to September 4. The smallest chance of a wet day is 29% on July 17.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 43% on September 23.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Kodiak experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Kodiak. The most rain falls during the 31 days centered around September 29, with an average total accumulation of 4.7 inches.
The least rain falls around July 4, with an average total accumulation of 2.5 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Kodiak experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.4 months, from November 3 to April 14, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 14, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 6.6 months, from April 14 to November 3. The least snow falls around July 25, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Kodiak varies extremely over the course of the year. In 2017, the shortest day is December 21, with 6 hours, 31 minutes of daylight; the longest day is June 20, with 18 hours, 7 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:07 AM on June 18, and the latest sunrise is 4 hours, 47 minutes later at 9:54 AM on December 27. The earliest sunset is at 4:21 PM on December 14, and the latest sunset is 6 hours, 54 minutes later at 11:15 PM on June 23.
Daylight saving time (DST) is observed in Kodiak during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Kodiak, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Kodiak experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.2 months, from September 19 to April 25, with average wind speeds of more than 13.0 miles per hour. The windiest day of the year is December 29, with an average hourly wind speed of 16.9 miles per hour.
The calmer time of year lasts for 4.8 months, from April 25 to September 19. The calmest day of the year is July 16, with an average hourly wind speed of 9.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Kodiak varies throughout the year.
The wind is most often from the north for 1.7 months, from February 14 to April 6, with a peak percentage of 30% on March 13. The wind is most often from the east for 2.8 months, from April 6 to June 30 and for 1.5 months, from December 27 to February 14, with a peak percentage of 34% on June 12. The wind is most often from the west for 5.9 months, from June 30 to December 27, with a peak percentage of 41% on August 23.
Kodiak is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.6 months, from July 5 to September 23, with an average temperature above 50°F. The day of the year with the warmest water is August 12, with an average temperature of 52°F.
The time of year with cooler water lasts for 5.0 months, from December 9 to May 8, with an average temperature below 42°F. The day of the year with the coolest water is March 8, with an average temperature of 39°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Kodiak throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Kodiak for general outdoor tourist activities is from mid July to late August, with a peak score in the first week of August.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Kodiak for hot-weather activities is from early to mid July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Kodiak typically lasts for 5.1 months (156 days), from around May 1 to around October 4, rarely starting before April 9 or after May 24, and rarely ending before September 19 or after October 19.
Time Spent in Various Temperature Bands and the Growing Season
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
Based on growing degree days alone, the first spring blooms in Kodiak should appear around July 1, only rarely appearing before June 17 or after July 20.
Growing Degree Days
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.4 months, from May 3 to August 15, with an average daily incident shortwave energy per square meter above 4.4 kWh. The brightest day of the year is June 20, with an average of 5.5 kWh.
The darker period of the year lasts for 3.9 months, from October 23 to February 20, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest day of the year is December 20, with an average of 0.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Kodiak are 57.790 deg latitude, -152.407 deg longitude, and 56 ft elevation.
The topography within 2 miles of Kodiak contains very significant variations in elevation, with a maximum elevation change of 1,243 feet and an average elevation above sea level of 195 feet. Within 10 miles contains very significant variations in elevation (2,510 feet). Within 50 miles contains large variations in elevation (4,341 feet).
The area within 2 miles of Kodiak is covered by water (58%), shrubs (16%), trees (14%), and sparse vegetation (11%), within 10 miles by water (62%) and shrubs (26%), and within 50 miles by water (68%) and shrubs (19%).
This report illustrates the typical weather in Kodiak, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There is only a single weather station, Kodiak Benny Benson State Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Kodiak.
At a distance of 6 kilometers from Kodiak, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Kodiak according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.